Still extractor with novel stopcock means

Claim 2

A solvent extractor comprising a distillation flask, an extraction unit connected to said distillation flask and a condenser, said extraction unit comprising: a container for holding a substance for treatment with a solvent, a vapor inlet tube through which the vapor of a solvent may be introduced into said container, vapor outlet tubes fitted on the said container so that said vapor may be conveyed to a reflux condenser, connecting means to connect the vapor-inlet tube and the vapor outlet tubes, and siphon means whereby the extract collected in the container may be discharged from said container to the distillation flask, said siphon means having a bent tube formed of two legs comprising a shorter leg having the outlet for the extract from the container and a longer leg having the extract discharging extremity into the distillation flask; said connecting means comprising: a three-way stopcock between said inlet and said outlet tubes, said stopcock further comprising a plug having an inlet channel and an outlet channel arranged such that the longitudinal axis of said outlet channel is normal to, but displaced from the longitudinal axis of said plug, the vapor conveyed through the said inlet tube being distributable between said reflux condenser and said container; the siphoning of the extract being broken off by closing said stopcock, thereby enabling the original substance to be retained in the container.

Claim 3

An extractor as claimed in claim 1 wherein said stopcock is a three-way stopcock having in the plug an angular path to the vapor passing therethrough.

Claim 4

An extractor as claimed in claim 1 wherein said stopcock comprises a conventional three-way stopcock.

Claim 5

An extractor as claimed in the preceding claim 1 including a standard joint at the outlet of the shorter leg of the siphon at the bottom of the container, and a quick-fit, removable and adjustable extension arm fitted to the shorter leg in reverse whereby the effective length of the shorter leg is reduced, thereby enabling the extractor useable for siphoning the extract of a solution by a lighter non-miscible solvent.

Claim 6

An extractor as claimed in claim 1 wherein said vapor may be conveyed further to said substance introduced in said container.

Claim 7

A solvent extractor comprising a distillation flask, an extraction unit connected to said distillation flask, and a condenser, said extraction unit comprising: an extraction container for holding a substance for treatment with a solvent, a vapor-inlet tube through which the vapor of a solvent may be introduced into said container from a source such as from a distillation flask, vapor-outlet tubes on said container so that said vapor may be conveyed to the condenser, connecting means to connect the vapor-inlet tube and the vapor-outlet tubes, and siphon means so that the extract collected in the container may be discharged from said container to the distillation flask, said siphon means comprising a bent tube formed of two legs, with a shorter leg having the outlet for the extract from the container and a longer leg having the extract discharging extremity into the distillation flask, said connecting means comprising a proportionating three-way stopcock comprising further: a. a socket having an inlet and two outlets, and b. a fitting plug having an inlet channel and an outlet channel arranged such that the longitudinal axis of said outlet channel is normal to, but displaced from the longitudinal axis of said plug, c. the socket and the plug comprising said three-way stopcock between said inlet and outlet tubes so that the solvent vapors from the distillation flask are enabled to be proportionated between those led to the condenser and those led into the substance contained in the container whereby the temperature of extraction can be controlled, immiscible phases can be allowed to separate, the siphoning of the extract can take place, the siphoning of the extract can be broken at will.

Claim 8

A solvent extractor comprising a distillation flask, an extraction unit connected to said distillation flask, and a condenser, said extraction unit comprising: an extraction container for holding a substance for treatment with a solvent, a vapor-inlet tube through which the vapor of a solvent may be introduced into said container from a source such as from a distillation flask, vapor-outlet tubes on said container so that said vapor may be conveyed to the condenser, connecting means to connect the vapor-inlet tube and the vapor-outlet tubes, and siphon means so that the extract collected in the container may be discharged from said container to the distillation flask, said siphon means comprising a bent tube formed of two legs, with a shorter leg having the outlet for the extract from the container and a longer leg having the extract discharging extremity into the distillation flask, said connecting means comprising a proportionating three-way stopcock comprising further: a. a socket having an inlet and two outlets, and b. a fitting plug having an inlet channel and an outlet channel arranged such that the longitudinal axis of said outlet channel is normal to, but displaced from the longitudinal axis of said plug, c. the socket and the plug comprising said three-way stopcock between said inlet and outlet tubes so that the solvent vapors from the distillation flask are enabled to be proportionated between those led to the condenser and those led into the substance contained in the container whereby the temperature of extraction can be controlled, immiscible phases can be allowed to separate, the siphoning of the extract can take place, the siphoning of the extract can be broken at will.

Claim 9

An extractor as claimed in claim 6 wherein said vapor may be conveyed further to the substance introduced in said container.